A Koch-Like Sided Fractal Bow-Tie Dipole Antenna

作者：Li, Daotie^*; Mao, Jun-fa

来源：IEEE Transactions on Antennas and Propagation, 2012, 60(5): 2242-2251.

DOI：10.1109/TAP.2012.2189719

• coplanar stripline (CPS)
• fractal-like
• Koch curve
• Koch-like
• multiband
• Sierpinski gasket
• ultra-wideband (UWB)
• Bow-tie

A novel Koch-like fractal curve is proposed to transform ultra-wideband (UWB) bow-tie into so called Koch-like sided fractal bow-tie dipole. A small isosceles triangle is cut off from center of each side of the initial isosceles triangle, then the procedure iterates along the sides like Koch curve does, forming the Koch-like fractal bow-tie geometry. The fractal bow-tie of each iterative is investigated without feedline in free space for fractal trait unveiling first, followed by detailed expansion upon the four-iterated pragmatic fractal bow-tie dipole fed by 50-Omega coaxial SMA connector through coplanar stripline (CPS) and comparison with Sierpinski gasket. The fractal bow-tie dipole can operate in multiband with moderate gain (3.5-7 dBi) and high efficiency (60%-80%), which is corresponding to certain shape parameters, such as notch ratio, notch angle phi, and base angles theta of the isosceles triangle. Compared with conventional bow-tie dipole and Sierpinski gasket with the same size, this fractal-like antenna has almost the same operating properties in low frequency and better radiation pattern in high frequency in multi-band operation, which makes it a better candidate for applications of PCS, WLAN, WiFi, WiMAX, and other communication systems.

• 出版日期2012-5
• 单位上海交通大学